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Title: Preparation of composites of nickel ferrites dispersed in silica matrix
Title of periodic: Journal of Magnetism and Magnetic Materials Amsterdam
Authors: Silva, Juliana Batista da
Mohallem, N.D.S.
Affiliation: Centro de Desenvolvimento da Tecnologia Nuclear/CDTN, Belo Horizonte, MG, Brasil
Universidade Federal de Minas Gerais/UFMG, Belo Horizonte, MG, Brasil
Issue Date: 2001
Keywords: Ferrites;composite materials;sol-gel process
Abstract: Composites of nickel ferrite particles dispersed in porous silica matrix (NiFe2O4/SiO2)0 have been prepared by sol-gel process using tetraethylorthosilicate (TEOS) as a precursor of silica, and metallic nitrates as precursors of ferrite. Wet samples prepared in monolithic form have been dried at 110 Celsius degree for 24 h and thermally treated for 2 h at various temperatures. NiFe2O4 particles were formed in the matrix pores and the nucleation of these particles was observed with the increase in the drying temperature. The structural and magnetic changes of these xerogels have been studied and compared with the properties of nickel ferrites obtained by coprecipitation process. The composites presented magnetic susceptibility values two orders of magnitude higher than that of ferrite prepared by coprecipitation.
Access: L
Appears in Collections:Artigo de periódico

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